Emily

"Emily" a.k.a. "The Doodlebug" is one of nine short stories written by Leslie Charteris and included in the twenty-eighth Saint book Saint Errant published in 1948.

Plot
After an elderly inventor dies, Simon Templar takes possession of the man's metal detector (a.k.a. "Doodlebug") and uses it to avenge an elderly lady who has fallen victim to a gold mine scam.